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Questionable Valves?
#11
I was just hoping maybe somebody could Identify them either way. Thank you so much guys. On a side not the exhaust tips are magnetic so I believe the tips were fusion welded for hardness and the intakes are fully stainless. But I cannot use them unless I know where they came from, I was just hoping the part numbers would help. But I will not cheap out and ruin a good set of heads!
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#12
Ruining the heads would be the least of your worries. Take another look at Hemikiller's pictures, and what happens when a valve head falls off. Camshaft, crankshaft, oil pump, and cylinder walls are destroyed.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#13
(12-03-2018, 08:15 AM)Omie01 Wrote: I was just hoping maybe somebody could Identify them either way. Thank you so much guys. On a side not the exhaust tips are magnetic so I believe the tips were fusion welded for hardness and the intakes are fully stainless. But I cannot use them unless I know where they came from, I was just hoping the part numbers would help. But I will not cheap out and ruin a good set of heads!

Well they make stainless that is magnetic so there is no easy way to be certain what they are but I wouldn't use them on a high perf build. If they are marginally weak material the increased valve spring pressure in a high perf build will cause them to wear and eventually fail prematurely.
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#14
Since they are from India, use them the next time you prepare curry or chutney. Just not in your engine. Sorry... Wink
[+] 1 user Likes donkost's post
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#15
I found out what brand the valves are. The intakes are made by Di Kar Valve, and I guess the exhaust are made by Precision Engine Products? I have never heard of either of these. Has anybody else? There is precious little about either online. Supposedly they are budget valves bought in bulk?
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#16
(12-06-2018, 08:13 AM)Omie01 Wrote: I found out what brand the valves are. The intakes are made by Di Kar Valve, and I guess the exhaust are made by Precision Engine Products? I have never heard of either of these. Has anybody else? There is precious little about either online. Supposedly they are budget valves bought in bulk?

PEP has been around for a long time. To my knowledge, I've never used any of their products. 

https://docs.wixstatic.com/ugd/8c5737_72...bee5db.pdf

At least you know what they are.


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#17
If you are checking the valves with a magnet only 300 series stainless is non magnetic and would not be suitable for a valve that I know of. It would probably a 21-2n or 21-4n series stainless and that is magnetic I believe. Some valves are Stellite, Inconel or even titanium. Here is some reading material on valves. The suggest using copper alloy seats with titanium valves to dissipate the heat. Not saying they are know all see all page just more information. https://www.enginebuildermag.com/2016/03...and-seats/
I had said before that Ford used Inconel exhaust valves in the SVO engines due to being turbo charged. The flathead had stellite valve seats and maybe exhaust valves.
You can spend a fortune of valves but if you float them does not matter what they are made of they will do damage to the engine.
When I was talking with Lee Holman of Holman Moody he was telling me the sodium filled valves like used in the SOHC 427 would actually eat through the valve stem and cause them to break. He warned that if you found a NOS SOHC 427 not to even turn it over with the starter it would break the valves due to the corrosion inside the stem.
Some valves even have the seating surface welded with a different material for wear.
When I was working we had a hard chrome vat in the shop so I hard chromed the valve stems in my flathead engine. There are a bunch of newer coatings that are even better today.
Valves are like some women look good on the outside the just will not hold up, lol.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#18
The inside of an engine is not where you want to be taking chances, cutting corners or saving money.

Period.

I try and avoid buying anything used or rebuilt because of this, it’s impossoble (within practical reason) to verify what you have, you are relying on somebody being honest and unfortunately one can’t rely on that Any longer.
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#19
That's how I ended up with the valves, I worked out a trade for something and I told the guy if he had a set of "good" valves I would trade. And he sent me these. He will hear my complaint today because I'm sure he was just pawning them off. What a world we live in!!
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